The Connection of the Physical Sciences
Format: Paperback
ISBN13: 9780217381338
Paperback|9780217381338
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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: ity be at rest, or moving uniformly in space. It is computed that had the earth received its motion from a single impulse, such impulse must have passed through a point about twenty-five miles from its centre. Since the motions of rotation and translation of the planets are independent of each other, though probably communicated by the same impulse, they form separate subjects of investigation. SECTION III. A planet moves in its elliptical orbit with a velocity varying every instant, in consequence of two forces, one tending to the centre of the sun, and the other in the direction of a tangent to its orbit, arising from the primitive impulse given at the time when it was launched into space: should the force in the tangent cease, the planet would fall to the sun by its gravity; were the sun not to attract it, the planet would fly off in the tangent. Thus, when the planet is in aphelion, or at the point where the orbit is fartherest from the sun, his action overcomes the planet's velocity, and brings it towards him with such an accelerated motion, that, at last it overcomes the sun's attraction, and shooting past him, gradually decreases in velocity, until it arrives at the aphelion where the sun's attraction again prevails. In this motion the radii vectores, or imaginary lines joining the centres of the sun and the planets, pass over equal areas in equal times. If the planets were attracted by the sun only, this would ever be their course; and because his action is proportional to his mass, which is much larger than that of allihc planets put together, the elliptical is the nearest approximation to their true motions, which are extremely complicated, in consequence of their mutual attraction, so that they do not move in any known or symmetrical curve, but in paths no...
| ISBN-13 | 9780217381338 |
|---|---|
| ISBN-10 | 0217381332 |
| Weight | 0.84 Pounds |
| Dimensions | 9.00 x 6.00 x 0.58 In |
| List Price | $20.03 |
| Format | Paperback |
|---|---|
| Pages | 254 pages |
| Publisher | |
| Published On | 2009-08-01 |
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